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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* file.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/07/17 09:04:03 by cacharle #+# #+# */
/* Updated: 2019/07/19 06:59:37 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include "include.h"
int print_tail(char *filename, int tail_size, int argc, int good_counter)
{
int fildes;
if ((fildes = open(filename, O_RDONLY)) < 0)
return (-1);
if (argc != 1 && good_counter != 0)
ft_putstr("\n");
if (argc > 4)
{
ft_putstr("==> ");
ft_putstr(filename);
ft_putstr(" <==\n");
}
if ((print_file_tail(fildes, tail_size)) < 0)
return (-1);
if ((close(fildes)) < 0)
return (-1);
return (0);
}
int print_file_tail(int fildes, int tail_size)
{
char *file;
int file_size;
file = NULL;
file_size = read_file(fildes, &file);
if (file_size < 0)
return (-1);
if (tail_size > file_size)
tail_size = file_size;
if (file == NULL)
return (0);
if ((write(STDOUT_FILENO, file + file_size - tail_size, tail_size)) < 0)
return (-1);
free(file);
return (0);
}
int read_file(int fildes, char **file)
{
char buf[BUF_SIZE];
int file_size;
int read_size;
file_size = 0;
while ((read_size = read(fildes, buf, BUF_SIZE)))
{
if (read_size < 0)
return (-1);
*file = ft_memcat(*file, buf, file_size, read_size);
file_size += read_size;
}
return (file_size);
}
char *ft_memcat(char *file, char buf[BUF_SIZE], int file_size,
int read_size)
{
int i;
char *file_clone;
if ((file_clone = malloc(sizeof(char) * (file_size + 1))) == NULL)
return (NULL);
i = -1;
while (++i < file_size)
file_clone[i] = file[i];
free(file);
if ((file = malloc(sizeof(char) * (file_size + read_size + 1))) == NULL)
return (NULL);
i = 0;
while (i < file_size)
{
file[i] = file_clone[i];
i++;
}
free(file_clone);
while (i < file_size + read_size)
{
file[i] = buf[i - file_size];
i++;
}
return (file);
}
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